油井出砂高频振动信号采集监测系统

油井在生产过程中适度出砂开采可以降低成本、提高开发效率和油井产能。通过室内模拟油井出砂环境实验,研发了一套对油井出砂产生的高频振动信号进行实时监测的系统。该系统通过对不同粒径的砂粒撞击管壁产生的高频振动信号进行时频分析,确定了砂粒撞击管壁产生的振动信号所在的频率段为10 000～20 000 Hz,得到了油井出砂状态下砂粒的振动特征频率,进而获得了不同出砂量与信号时域幅值和自功率谱幅值的关系曲线,实现了对油井出砂量的实时检测,验证了高频振动信号监测油井出砂的可行性。

High frequency vibration signal acquisition system used for sanding monitoring in oil well

Moderate sand yielding technology can exploit crude oil with low cost and high efficiency, and improve the well productivity effectively. This technology needs to control sand concentration of the produced fluid in a certain range, which requires real-time monitoring wells sand conditions. In order to study the method of real-time monitoring of the sand signal, the laboratory has developed a system of high frequency vibration signal used for monitoring the signal of sand. Through the time-frequency analysis of vibration signals of different sizes of sand hitting on the pipe wall in the laboratory simulation of sand production, the frequency range of the characteristic frequency of vibration signals reflecting the information of sand is screened out between 10-12 kHz, which proves the feasibility of the pipeline high-frequency vibration signal monitoring system. It has an important guiding significance for further study on sanding monitoring.